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First you need to generate Bitcoin secret private and public keys
$ openssl ecparam -genkey -name secp256k1 -text -noout -outform DER | xxd -p -c 1000 | sed 's/41534e31204f49443a20736563703235366b310a30740201010420/Private Key: /' | sed 's/a00706052b8104000aa144034200/\'$'\nPublic Key: /'
Private Key: ***
Public Key: 04***

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Or you can derive public key from existing secret private key (replace *** with private key in hex without 0x)
$ /usr/local/Cellar/openssl/1.0.2n/bin/openssl ec -inform DER -text -noout -in <(cat <(echo -n "302e0201010420") <(echo -n "***") <(echo -n "a00706052b8104000a") | xxd -r -p) 2>/dev/null | tail -6 | head -5 | sed 's/[ :]//g' | tr -d '\n' && echo
Public Key: ***

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At the end you need to add your secret private key and found private key (replace ***'s with private keys in hex without 0x)
$ (echo 'ibase=16;obase=10' && (echo '(*** + ***) % FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F' | tr '[:lower:]' '[:upper:]')) | bc
Private Key: ***

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